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Renesas ISL85005FRZ-TK
- Part No.:
- ISL85005FRZ-TK
- Manufacturer:
- Renesas
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
ISL85005FRZ-TK.pdf
- Description:
- IC REG BUCK ADJ 5A 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,770
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Product details
Overview
ISL85005FRZ-TK from Renesas Electronics is a monolithic synchronous buck regulator with integrated 5A/18V high-side and low-side MOSFETs, 4.5V–18V input range, fixed 500kHz switching frequency, and synchronization capability. It delivers up to 5A output current with ±1% 0.8V feedback reference and supports Diode Emulation Mode (DEM) or Forced CCM for light-load efficiency optimization in point-of-load power supplies.
For engineers reviewing the ISL85005FRZ-TK datasheet, ISL85005FRZ-TK pinout, ISL85005FRZ-TK application, or ISL85005FRZ-TK equivalent, key selection criteria include its internal bootstrap diode, programmable soft-start (via external capacitor on SS pin), Power-Good indicator, and robust protection suite including cycle-by-cycle overcurrent, input/output OVP, UVLO, and thermal shutdown.
Technical Context
The ISL85005FRZ-TK implements current-mode control with internal slope compensation and supports both internal and external loop compensation. Its SYNC/MODE pin enables external clock synchronization (300kHz–2MHz) or mode selection between Forced CCM and DEM - the latter enabling discontinuous conduction at light loads to improve efficiency.
It integrates a 5V LDO (VDD) derived from VIN, an undervoltage-detecting bootstrap circuit, and dual overcurrent protection: high-side cycle-by-cycle forward limit (7.8A typ) and low-side reverse current limit (−3.3A). The device operates across −40°C to +125°C junction temperature with 41°C/W θJA in its 3mm×4mm DFN package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 18V - supports multi-cell batteries and standard 5V/12V rails without pre-regulation. |
| Output Current | 5A continuous - sufficient for FPGA core, SoC, or ASIC point-of-load applications. |
| Switching Frequency | Fixed 500kHz (internally set), synchronizable 300kHz–2MHz - balances EMI, size, and efficiency. |
| Feedback Reference | 0.800V ±1% - enables precise output voltage setting down to 0.8V with external resistor divider. |
| Protection Features | Input UVLO (4.35V rising), input/output OVP, high-side forward OCP (7.8A), low-side reverse OCP (−3.3A), thermal shutdown (165°C) - ensures system-level reliability without external monitoring. |
| Package | 12-pin 3mm×4mm DFN with EPAD - provides low thermal resistance (θJC = 3°C/W) and compact footprint for high-density PCBs. |
Pinout & Package
ISL85005FRZ-TK uses a 12-pin 3mm×4mm Dual Flat No-Lead (DFN) package with exposed thermal pad (EPAD) for enhanced heat dissipation. Pin numbering follows top-view layout with pin 1 at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SYNC/MODE) | Synchronization and mode control input | Selects FCCM (pull to VDD), DEM (pull to AGND), or external sync (300–2000kHz); internal 1MΩ pull-up prevents floating state. |
| 2 (PG) | Open-drain Power-Good output | Asserts high ~1.5ms after output reaches 85% of regulation threshold; requires external pull-up (10kΩ–100kΩ). |
| 3 (EN) | Enable control input | Active-high enable; device starts when voltage exceeds 0.6V (60mV hysteresis); pulls down to disable. |
| 4 (FB) | Feedback node | Negative input to error amplifier; sets output voltage via resistor divider referenced to 0.8V internal reference. |
| 5 (COMP) | Compensation network node | Connect to AGND for internal compensation; connect external RC network between COMP and FB for custom loop tuning. |
| 6 (AGND) | Analog ground reference | Return path for internal analog circuitry; must be connected to board ground plane and tied to PGND internally. |
| 7,8 (PHASE) | Switch node | Drives external output inductor; connects directly to source of low-side FET and drain of high-side FET. |
| 9,10 (VIN) | Main power input | Supplies high-side gate driver and internal circuitry; requires local ceramic decoupling to PGND. |
| 11 (VDD) | Internal LDO output | 5V regulated supply for analog/digital blocks; bypass with 1µF capacitor; connect to VIN if VIN is 3–5.5V for higher efficiency. |
| 12 (BOOT) | Bootstrap supply | Floating supply for high-side gate driver; requires 0.1µF capacitor between BOOT and PHASE. |
| (EPAD) PGND | Power ground / thermal pad | Source connection of low-side MOSFET and primary thermal path; must be soldered to large copper area with multiple vias. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Bootstrap Diode | Eliminates external bootstrap diode, reducing BOM count and improving startup reliability under low-VIN conditions. |
| Diode Emulation Mode (DEM) | Disables low-side FET during light load to emulate diode conduction, boosting efficiency below ~1A without requiring external control logic. |
| Programmable Soft-Start | SS pin accepts external capacitor to scale soft-start time beyond default 2.3ms, limiting inrush current during power-up in sensitive systems. |
| Robust Overcurrent Protection | Dual-path detection: high-side cycle-by-cycle forward limit (7.8A) and low-side reverse current limit (−3.3A) prevent damage during short-circuit or reverse-bias events. |
| Power-Good Indicator | PG pin provides system-level status signaling with 1.5ms delay and 3% hysteresis, enabling safe sequencing with downstream logic or processors. |
Applications
| Network Equipment Power | Battery-Powered Systems |
|---|---|
Use Scenario: Providing 3.3V/5V rails for Ethernet PHYs, packet processors, and management controllers in 1U switches. IC Role / Device Role / Timing Role: Primary point-of-load regulator converting 12V backplane to processor I/O and interface voltages. Use Value: High efficiency at partial load (via DEM) extends thermal margin in fanless enclosures; 500kHz switching enables small 3.3µH inductors. | Use Scenario: Powering motor drivers and sensors in portable test equipment with 2S–4S Li-ion battery input (8.4V–16.8V). IC Role / Device Role / Timing Role: Main DC-DC converter delivering stable 5V to MCU and peripherals across wide battery discharge curve. Use Value: 4.5V–18V input range accommodates full battery voltage swing without intermediate stages; UVLO prevents brownout operation. |
| Multifunction Printer Logic | Embedded Computing Core Supply |
Use Scenario: Generating 1.8V/2.5V rails for image processing ASICs and memory interfaces in office printers. IC Role / Device Role / Timing Role: Secondary buck regulator stepping down 5V rail to low-voltage digital cores. Use Value: ±1% 0.8V reference ensures tight output tolerance required by high-speed SerDes and DDR interfaces. | Use Scenario: Supplying 1.2V core voltage to ARM Cortex-A series SoCs in industrial HMIs with strict thermal constraints. IC Role / Device Role / Timing Role: High-current core regulator operating in Forced CCM for ripple-sensitive digital loads. Use Value: Low RDS(on) MOSFETs (57mΩ HS / 40mΩ LS) minimize conduction loss; EPAD package sustains 5A continuous under 65°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISL85005AFRZ-TK | Fixed 500kHz frequency only; programmable soft-start via SS pin; no SYNC functionality. | Preferred where external clock synchronization is unnecessary but adjustable startup timing is critical. | Select ISL85005AFRZ-TK when DEM mode is not required and soft-start customization outweighs sync flexibility. |
| MPQ4572GQB-Z | Monolithic 5A buck with 3.3V–36V input, 500kHz fixed frequency, no sync or DEM; lower quiescent current (25µA). | Better suited for wide-input industrial sensors; lacks light-load efficiency optimization and sync capability. | Choose MPQ4572GQB-Z for cost-sensitive, wide-VIN applications without need for mode control or clock alignment. |
Compared with ISL85005FRZ-TK, ISL85005AFRZ-TK trades synchronization for soft-start programmability, while MPQ4572GQB-Z offers broader input range but omits DEM and sync - making ISL85005FRZ-TK optimal for synchronized, efficiency-aware 12V-rail systems.
Availability
ISL85005FRZ-TK is available at Aetrix Electronics and suitable for network equipment power, battery-powered systems, and embedded computing applications requiring stable component supply, RoHS-compliant packaging, and guaranteed long-term availability.
Supply support for ISL85005FRZ-TK includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Renesas Electronics is a global semiconductor leader delivering microcontrollers, analog power, and connectivity solutions for automotive, industrial, and enterprise markets.
The ISL85005FRZ-TK belongs to Renesas' ISL8500x family of monolithic synchronous buck regulators, designed specifically for high-efficiency, space-constrained point-of-load conversion in communications infrastructure and portable electronics.
FAQ
What is the switching frequency configuration of the ISL85005FRZ-TK?
The ISL85005FRZ-TK has a default internally set switching frequency of 500kHz and supports external synchronization from 300kHz to 2MHz via the SYNC/MODE pin. Unlike the ISL85005A variant, it does not offer programmable soft-start but retains full mode control for Forced CCM or Diode Emulation Mode. This makes ISL85005FRZ-TK ideal for systems requiring clock alignment with other converters or noise-sensitive environments.
Does the ISL85005FRZ-TK support light-load efficiency optimization?
Yes, the ISL85005FRZ-TK supports Diode Emulation Mode (DEM), which disables the low-side MOSFET during light-load conditions to reduce switching losses and improve efficiency below ~1A. This mode is selected by pulling the SYNC/MODE pin to AGND. In contrast, Forced CCM maintains continuous inductor current regardless of load - ensuring low output ripple for noise-sensitive circuits. Both modes are user-selectable without changing external components.
What protections are built into the ISL85005FRZ-TK?
The ISL85005FRZ-TK integrates comprehensive protection: input UVLO (4.35V rising edge), input and output overvoltage protection, high-side cycle-by-cycle forward current limit (7.8A typical), low-side forward and reverse overcurrent limits, and thermal shutdown at 165°C with 10°C hysteresis. These features eliminate the need for external fault-monitoring circuitry and ensure reliable operation in unattended or harsh environments where ISL85005FRZ-TK serves as the primary power stage.
Can the ISL85005FRZ-TK operate with a 5V input supply?
Yes, the ISL85005FRZ-TK supports input voltages from 4.5V to 18V, making it fully compatible with 5V rails. When VIN is between 3V and 5.5V, the datasheet recommends connecting VDD directly to VIN to bypass the internal LDO and improve conversion efficiency. For 5V input, this configuration reduces internal power loss and enhances overall system efficiency - particularly valuable in low-voltage, high-current applications where ISL85005FRZ-TK delivers up to 5A.
What is the thermal performance of the ISL85005FRZ-TK in its DFN package?
The ISL85005FRZ-TK uses a 12-pin 3mm×4mm DFN package with exposed thermal pad (EPAD), achieving θJC = 3°C/W and θJA = 41°C/W under standard JEDEC test conditions. With proper PCB layout - including a solid thermal pad connected via ≥6 thermal vias to inner ground planes - the device sustains 5A continuous output current at ambient temperatures up to 65°C. This thermal capability makes ISL85005FRZ-TK suitable for compact, sealed enclosures where forced airflow is unavailable.
ISL85005FRZ-TK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 12-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 15V
- Current - Output:
- 5A
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (4x3)
ISL85005FRZ-TK FAQ
1.How can I place an order for ISL85005FRZ-TK through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL85005FRZ-TK on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ISL85005FRZ-TK reliable?
The price and inventory of ISL85005FRZ-TK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL85005FRZ-TK is usually 5 days.
3.What payment methods are accepted for ISL85005FRZ-TK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL85005FRZ-TK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL85005FRZ-TK?
ISL85005FRZ-TK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL85005FRZ-TK order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ISL85005FRZ-TK?
For technical support, including ISL85005FRZ-TK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL85005FRZ-TK requirements.
6.How does Aetrix verify that ISL85005FRZ-TK is sourced from the original manufacturer or authorized distributors?
All ISL85005FRZ-TK products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ISL85005FRZ-TK meets industry standards.
7.What is the process for return or replacement of ISL85005FRZ-TK?
All ISL85005FRZ-TK units undergo pre-shipment inspection (PSI). If there is an issue with ISL85005FRZ-TK, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ISL85005FRZ-TK part is unused and in its original packaging.
Return procedure for ISL85005FRZ-TK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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